/Engine/Source/Runtime/MovieScene/Public/Evaluation/PreAnimatedState/MovieScenePreAnimatedCaptureSources.h
Make an association for the specifieid evaluation key to the value specified by Entry, along with an indication of whether it should be restored on completion
[EPreAnimatedCaptureSourceState](API\Runtime\MovieScene\Evaluation\PreAnimatedState\UE__MovieScene__-) BeginTrackingCaptureSource ( const KeyType & InKey, const [FPreAnimatedStateMetaData](API\Runtime\MovieScene\Evaluation\PreAnimatedState\FPreAnimatedStateMetaData) & MetaData )